What is the molecular formula of phosphorus pentoxide?

$(i)$ Name a metal which does not stick to glass.
$(ii)$ Name the metal which is commonly used in thermite welding.
$(iii)$ What is the nature of zinc oxide?

What is an ore of iron?

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of :

Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
$(i)$ $Au$
$(ii)$ $Cu$
$(iii)$ $Na$
$(iv)$ $K$

Give two examples each of metals that are good conductors and poor conductors of heat,respectively.